The Only Way Iron Man Should Be Recast, According To Joe Russo

Robert Downey Jr. has been playing Tony Stark since 2008's Iron Man, making him not only the Marvel Cinematic Universe's longest-tenured superhero, but one of the longest-running protagonists in the superhero movie genre. While it looks like Iron Man 4 won't see the light of day, Downey's Stark isn't going away anytime soon, as he'll be appearing in Captain America: Civil War and the Avengers: Infinity War movies. However, there will inevitably come a day when Downey decides to hang up the armor...